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hotspot/src/share/vm/prims/stackwalk.cpp
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*** 1,7 ****
/*
! * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
--- 1,7 ----
/*
! * Copyright (c) 2015, 2016 Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*** 35,80 ****
#include "runtime/javaCalls.hpp"
#include "runtime/vframe.hpp"
#include "utilities/globalDefinitions.hpp"
// setup and cleanup actions
! void StackWalkAnchor::setup_magic_on_entry(objArrayHandle frames_array) {
frames_array->obj_at_put(magic_pos, _thread->threadObj());
_anchor = address_value();
assert(check_magic(frames_array), "invalid magic");
}
! bool StackWalkAnchor::check_magic(objArrayHandle frames_array) {
oop m1 = frames_array->obj_at(magic_pos);
jlong m2 = _anchor;
if (m1 == _thread->threadObj() && m2 == address_value()) return true;
return false;
}
! bool StackWalkAnchor::cleanup_magic_on_exit(objArrayHandle frames_array) {
bool ok = check_magic(frames_array);
frames_array->obj_at_put(magic_pos, NULL);
_anchor = 0L;
return ok;
}
! // Returns StackWalkAnchor for the current stack being traversed.
//
// Parameters:
// thread Current Java thread.
// magic Magic value used for each stack walking
// frames_array User-supplied buffers. The 0th element is reserved
! // to this StackWalkAnchor to use
//
! StackWalkAnchor* StackWalkAnchor::from_current(JavaThread* thread, jlong magic,
objArrayHandle frames_array)
{
assert(thread != NULL && thread->is_Java_thread(), "");
oop m1 = frames_array->obj_at(magic_pos);
if (m1 != thread->threadObj()) return NULL;
if (magic == 0L) return NULL;
! StackWalkAnchor* anchor = (StackWalkAnchor*) (intptr_t) magic;
if (!anchor->is_valid_in(thread, frames_array)) return NULL;
return anchor;
}
// Unpacks one or more frames into user-supplied buffers.
--- 35,80 ----
#include "runtime/javaCalls.hpp"
#include "runtime/vframe.hpp"
#include "utilities/globalDefinitions.hpp"
// setup and cleanup actions
! void JavaFrameStream::setup_magic_on_entry(objArrayHandle frames_array) {
frames_array->obj_at_put(magic_pos, _thread->threadObj());
_anchor = address_value();
assert(check_magic(frames_array), "invalid magic");
}
! bool JavaFrameStream::check_magic(objArrayHandle frames_array) {
oop m1 = frames_array->obj_at(magic_pos);
jlong m2 = _anchor;
if (m1 == _thread->threadObj() && m2 == address_value()) return true;
return false;
}
! bool JavaFrameStream::cleanup_magic_on_exit(objArrayHandle frames_array) {
bool ok = check_magic(frames_array);
frames_array->obj_at_put(magic_pos, NULL);
_anchor = 0L;
return ok;
}
! // Returns JavaFrameStream for the current stack being traversed.
//
// Parameters:
// thread Current Java thread.
// magic Magic value used for each stack walking
// frames_array User-supplied buffers. The 0th element is reserved
! // to this JavaFrameStream to use
//
! JavaFrameStream* JavaFrameStream::from_current(JavaThread* thread, jlong magic,
objArrayHandle frames_array)
{
assert(thread != NULL && thread->is_Java_thread(), "");
oop m1 = frames_array->obj_at(magic_pos);
if (m1 != thread->threadObj()) return NULL;
if (magic == 0L) return NULL;
! JavaFrameStream* anchor = (JavaFrameStream*) (intptr_t) magic;
if (!anchor->is_valid_in(thread, frames_array)) return NULL;
return anchor;
}
// Unpacks one or more frames into user-supplied buffers.
*** 83,104 ****
// Do not call vfst.next to advance over the last returned value.
// In other words, do not leave any stale data in the vfst.
//
// Parameters:
// mode Restrict which frames to be decoded.
! // vfst vFrameStream.
// max_nframes Maximum number of frames to be filled.
// start_index Start index to the user-supplied buffers.
// frames_array Buffer to store Class or StackFrame in, starting at start_index.
// frames array is a Class<?>[] array when only getting caller
// reference, and a StackFrameInfo[] array (or derivative)
// otherwise. It should never be null.
// end_index End index to the user-supplied buffers with unpacked frames.
//
// Returns the number of frames whose information was transferred into the buffers.
//
! int StackWalk::fill_in_frames(jlong mode, vframeStream& vfst,
int max_nframes, int start_index,
objArrayHandle frames_array,
int& end_index, TRAPS) {
if (TraceStackWalk) {
tty->print_cr("fill_in_frames limit=%d start=%d frames length=%d",
--- 83,104 ----
// Do not call vfst.next to advance over the last returned value.
// In other words, do not leave any stale data in the vfst.
//
// Parameters:
// mode Restrict which frames to be decoded.
! // JavaFrameStream stream of javaVFrames
// max_nframes Maximum number of frames to be filled.
// start_index Start index to the user-supplied buffers.
// frames_array Buffer to store Class or StackFrame in, starting at start_index.
// frames array is a Class<?>[] array when only getting caller
// reference, and a StackFrameInfo[] array (or derivative)
// otherwise. It should never be null.
// end_index End index to the user-supplied buffers with unpacked frames.
//
// Returns the number of frames whose information was transferred into the buffers.
//
! int StackWalk::fill_in_frames(jlong mode, JavaFrameStream& stream,
int max_nframes, int start_index,
objArrayHandle frames_array,
int& end_index, TRAPS) {
if (TraceStackWalk) {
tty->print_cr("fill_in_frames limit=%d start=%d frames length=%d",
*** 106,118 ****
}
assert(max_nframes > 0, "invalid max_nframes");
assert(start_index + max_nframes <= frames_array->length(), "oob");
int frames_decoded = 0;
! for (; !vfst.at_end(); vfst.next()) {
! Method* method = vfst.method();
! int bci = vfst.bci();
if (method == NULL) continue;
if (!ShowHiddenFrames && StackWalk::skip_hidden_frames(mode)) {
if (method->is_hidden()) {
if (TraceStackWalk) {
--- 106,118 ----
}
assert(max_nframes > 0, "invalid max_nframes");
assert(start_index + max_nframes <= frames_array->length(), "oob");
int frames_decoded = 0;
! for (; !stream.at_end(); stream.next()) {
! Method* method = stream.method();
! int bci = stream.bci();
if (method == NULL) continue;
if (!ShowHiddenFrames && StackWalk::skip_hidden_frames(mode)) {
if (method->is_hidden()) {
if (TraceStackWalk) {
*** 131,141 ****
// fill in StackFrameInfo and initialize MemberName
if (live_frame_info(mode)) {
assert (use_frames_array(mode), "Bad mode for get live frame");
Handle stackFrame(frames_array->obj_at(index));
! fill_live_stackframe(stackFrame, method, bci, vfst.java_frame(), CHECK_0);
} else if (need_method_info(mode)) {
assert (use_frames_array(mode), "Bad mode for get stack frame");
Handle stackFrame(frames_array->obj_at(index));
fill_stackframe(stackFrame, method, bci);
} else {
--- 131,141 ----
// fill in StackFrameInfo and initialize MemberName
if (live_frame_info(mode)) {
assert (use_frames_array(mode), "Bad mode for get live frame");
Handle stackFrame(frames_array->obj_at(index));
! fill_live_stackframe(stackFrame, method, bci, stream.java_frame(), CHECK_0);
} else if (need_method_info(mode)) {
assert (use_frames_array(mode), "Bad mode for get stack frame");
Handle stackFrame(frames_array->obj_at(index));
fill_stackframe(stackFrame, method, bci);
} else {
*** 292,301 ****
--- 292,302 ----
//
oop StackWalk::walk(Handle stackStream, jlong mode,
int skip_frames, int frame_count, int start_index,
objArrayHandle frames_array,
TRAPS) {
+ ResourceMark rm(THREAD);
JavaThread* jt = (JavaThread*)THREAD;
if (TraceStackWalk) {
tty->print_cr("Start walking: mode " JLONG_FORMAT " skip %d frames batch size %d",
mode, skip_frames, frame_count);
}
*** 307,351 ****
Klass* stackWalker_klass = SystemDictionary::StackWalker_klass();
Klass* abstractStackWalker_klass = SystemDictionary::AbstractStackWalker_klass();
methodHandle m_doStackWalk(THREAD, Universe::do_stack_walk_method());
! // Open up a traversable stream onto my stack.
! // This stream will be made available by *reference* to the inner Java call.
! StackWalkAnchor anchor(jt);
! vframeStream& vfst = anchor.vframe_stream();
!
{
! while (!vfst.at_end()) {
! InstanceKlass* ik = vfst.method()->method_holder();
if (ik != stackWalker_klass &&
ik != abstractStackWalker_klass && ik->super() != abstractStackWalker_klass) {
break;
}
if (TraceStackWalk) {
! tty->print(" skip "); vfst.method()->print_short_name(); tty->print("\n");
}
! vfst.next();
}
// stack frame has been traversed individually and resume stack walk
// from the stack frame at depth == skip_frames.
! for (int n=0; n < skip_frames && !vfst.at_end(); vfst.next(), n++) {
if (TraceStackWalk) {
! tty->print(" skip "); vfst.method()->print_short_name();
tty->print_cr(" frame id: " PTR_FORMAT " pc: " PTR_FORMAT,
! p2i(vfst.frame_id()), p2i(vfst.frame_pc()));
}
}
}
- // The Method* pointer in the vfst has a very short shelf life. Grab it now.
int end_index = start_index;
int numFrames = 0;
! if (!vfst.at_end()) {
! numFrames = fill_in_frames(mode, vfst, frame_count, start_index,
frames_array, end_index, CHECK_NULL);
if (numFrames < 1) {
THROW_MSG_(vmSymbols::java_lang_InternalError(), "stack walk: decode failed", NULL);
}
}
--- 308,350 ----
Klass* stackWalker_klass = SystemDictionary::StackWalker_klass();
Klass* abstractStackWalker_klass = SystemDictionary::AbstractStackWalker_klass();
methodHandle m_doStackWalk(THREAD, Universe::do_stack_walk_method());
! // Setup traversal onto my stack.
! RegisterMap regMap(jt, true);
! JavaFrameStream stream(jt, ®Map);
{
! while (!stream.at_end()) {
! InstanceKlass* ik = stream.method()->method_holder();
if (ik != stackWalker_klass &&
ik != abstractStackWalker_klass && ik->super() != abstractStackWalker_klass) {
break;
}
if (TraceStackWalk) {
! tty->print(" skip "); stream.method()->print_short_name(); tty->print("\n");
}
! stream.next();
}
// stack frame has been traversed individually and resume stack walk
// from the stack frame at depth == skip_frames.
! for (int n=0; n < skip_frames && !stream.at_end(); stream.next(), n++) {
if (TraceStackWalk) {
! tty->print(" skip "); stream.method()->print_short_name();
tty->print_cr(" frame id: " PTR_FORMAT " pc: " PTR_FORMAT,
! p2i(stream.java_frame()->fr().id()),
! p2i(stream.java_frame()->fr().pc()));
}
}
}
int end_index = start_index;
int numFrames = 0;
! if (!stream.at_end()) {
! numFrames = fill_in_frames(mode, stream, frame_count, start_index,
frames_array, end_index, CHECK_NULL);
if (numFrames < 1) {
THROW_MSG_(vmSymbols::java_lang_InternalError(), "stack walk: decode failed", NULL);
}
}
*** 354,387 ****
// Java method java.lang.StackStreamFactory.AbstractStackWalker::doStackWalk
// which calls the implementation to consume the stack frames.
// When JVM_CallStackWalk returns, it invalidates the stack stream.
JavaValue result(T_OBJECT);
JavaCallArguments args(stackStream);
! args.push_long(anchor.address_value());
args.push_int(skip_frames);
args.push_int(frame_count);
args.push_int(start_index);
args.push_int(end_index);
// Link the thread and vframe stream into the callee-visible object
! anchor.setup_magic_on_entry(frames_array);
JavaCalls::call(&result, m_doStackWalk, &args, THREAD);
// Do this before anything else happens, to disable any lingering stream objects
! bool ok = anchor.cleanup_magic_on_exit(frames_array);
// Throw pending exception if we must
(void) (CHECK_NULL);
if (!ok) {
THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: corrupted buffers on exit", NULL);
}
// Return normally
return (oop)result.get_jobject();
-
}
// Walk the next batch of stack frames
//
// Parameters:
--- 353,385 ----
// Java method java.lang.StackStreamFactory.AbstractStackWalker::doStackWalk
// which calls the implementation to consume the stack frames.
// When JVM_CallStackWalk returns, it invalidates the stack stream.
JavaValue result(T_OBJECT);
JavaCallArguments args(stackStream);
! args.push_long(stream.address_value());
args.push_int(skip_frames);
args.push_int(frame_count);
args.push_int(start_index);
args.push_int(end_index);
// Link the thread and vframe stream into the callee-visible object
! stream.setup_magic_on_entry(frames_array);
JavaCalls::call(&result, m_doStackWalk, &args, THREAD);
// Do this before anything else happens, to disable any lingering stream objects
! bool ok = stream.cleanup_magic_on_exit(frames_array);
// Throw pending exception if we must
(void) (CHECK_NULL);
if (!ok) {
THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: corrupted buffers on exit", NULL);
}
// Return normally
return (oop)result.get_jobject();
}
// Walk the next batch of stack frames
//
// Parameters:
*** 398,434 ****
int frame_count, int start_index,
objArrayHandle frames_array,
TRAPS)
{
JavaThread* jt = (JavaThread*)THREAD;
! StackWalkAnchor* existing_anchor = StackWalkAnchor::from_current(jt, magic, frames_array);
! if (existing_anchor == NULL) {
THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: corrupted buffers", 0L);
}
if (frames_array.is_null()) {
THROW_MSG_(vmSymbols::java_lang_NullPointerException(), "frames_array is NULL", 0L);
}
if (TraceStackWalk) {
! tty->print_cr("StackWalk::moreFrames frame_count %d existing_anchor " PTR_FORMAT " start %d frames %d",
! frame_count, p2i(existing_anchor), start_index, frames_array->length());
}
int end_index = start_index;
if (frame_count <= 0) {
return end_index; // No operation.
}
int count = frame_count + start_index;
assert (frames_array->length() >= count, "not enough space in buffers");
! StackWalkAnchor& anchor = (*existing_anchor);
! vframeStream& vfst = anchor.vframe_stream();
! if (!vfst.at_end()) {
! vfst.next(); // this was the last frame decoded in the previous batch
! if (!vfst.at_end()) {
! int n = fill_in_frames(mode, vfst, frame_count, start_index,
frames_array, end_index, CHECK_0);
if (n < 1) {
THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: later decode failed", 0L);
}
return end_index;
--- 396,431 ----
int frame_count, int start_index,
objArrayHandle frames_array,
TRAPS)
{
JavaThread* jt = (JavaThread*)THREAD;
! JavaFrameStream* existing_stream = JavaFrameStream::from_current(jt, magic, frames_array);
! if (existing_stream == NULL) {
THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: corrupted buffers", 0L);
}
if (frames_array.is_null()) {
THROW_MSG_(vmSymbols::java_lang_NullPointerException(), "frames_array is NULL", 0L);
}
if (TraceStackWalk) {
! tty->print_cr("StackWalk::moreFrames frame_count %d existing_stream " PTR_FORMAT " start %d frames %d",
! frame_count, p2i(existing_stream), start_index, frames_array->length());
}
int end_index = start_index;
if (frame_count <= 0) {
return end_index; // No operation.
}
int count = frame_count + start_index;
assert (frames_array->length() >= count, "not enough space in buffers");
! JavaFrameStream& stream = (*existing_stream);
! if (!stream.at_end()) {
! stream.next(); // advance past the last frame decoded in previous batch
! if (!stream.at_end()) {
! int n = fill_in_frames(mode, stream, frame_count, start_index,
frames_array, end_index, CHECK_0);
if (n < 1) {
THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: later decode failed", 0L);
}
return end_index;
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